2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "ieee80211_led.h"
32 #include "ieee80211_rate.h"
34 #define IEEE80211_TX_OK 0
35 #define IEEE80211_TX_AGAIN 1
36 #define IEEE80211_TX_FRAG_AGAIN 2
40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
41 struct ieee80211_hdr
*hdr
)
43 /* Set the sequence number for this frame. */
44 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
46 /* Increase the sequence number. */
47 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
52 const struct sk_buff
*skb
)
54 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
59 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
65 fc
= le16_to_cpu(hdr
->frame_control
);
66 hdrlen
= ieee80211_get_hdrlen(fc
);
67 if (hdrlen
> skb
->len
)
70 printk(" FC=0x%04x DUR=0x%04x",
71 fc
, le16_to_cpu(hdr
->duration_id
));
73 printk(" A1=%s", print_mac(mac
, hdr
->addr1
));
75 printk(" A2=%s", print_mac(mac
, hdr
->addr2
));
77 printk(" A3=%s", print_mac(mac
, hdr
->addr3
));
79 printk(" A4=%s", print_mac(mac
, hdr
->addr4
));
82 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
83 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
87 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
89 static u16
ieee80211_duration(struct ieee80211_txrx_data
*tx
, int group_addr
,
92 int rate
, mrate
, erp
, dur
, i
;
93 struct ieee80211_rate
*txrate
= tx
->u
.tx
.rate
;
94 struct ieee80211_local
*local
= tx
->local
;
95 struct ieee80211_supported_band
*sband
;
97 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
100 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
101 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
104 * data and mgmt (except PS Poll):
105 * - during CFP: 32768
106 * - during contention period:
107 * if addr1 is group address: 0
108 * if more fragments = 0 and addr1 is individual address: time to
109 * transmit one ACK plus SIFS
110 * if more fragments = 1 and addr1 is individual address: time to
111 * transmit next fragment plus 2 x ACK plus 3 x SIFS
114 * - control response frame (CTS or ACK) shall be transmitted using the
115 * same rate as the immediately previous frame in the frame exchange
116 * sequence, if this rate belongs to the PHY mandatory rates, or else
117 * at the highest possible rate belonging to the PHY rates in the
121 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
122 /* TODO: These control frames are not currently sent by
123 * 80211.o, but should they be implemented, this function
124 * needs to be updated to support duration field calculation.
126 * RTS: time needed to transmit pending data/mgmt frame plus
127 * one CTS frame plus one ACK frame plus 3 x SIFS
128 * CTS: duration of immediately previous RTS minus time
129 * required to transmit CTS and its SIFS
130 * ACK: 0 if immediately previous directed data/mgmt had
131 * more=0, with more=1 duration in ACK frame is duration
132 * from previous frame minus time needed to transmit ACK
134 * PS Poll: BIT(15) | BIT(14) | aid
140 if (0 /* FIX: data/mgmt during CFP */)
143 if (group_addr
) /* Group address as the destination - no ACK */
146 /* Individual destination address:
147 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
148 * CTS and ACK frames shall be transmitted using the highest rate in
149 * basic rate set that is less than or equal to the rate of the
150 * immediately previous frame and that is using the same modulation
151 * (CCK or OFDM). If no basic rate set matches with these requirements,
152 * the highest mandatory rate of the PHY that is less than or equal to
153 * the rate of the previous frame is used.
154 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
157 /* use lowest available if everything fails */
158 mrate
= sband
->bitrates
[0].bitrate
;
159 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
160 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
162 if (r
->bitrate
> txrate
->bitrate
)
165 if (tx
->sdata
->basic_rates
& BIT(i
))
168 switch (sband
->band
) {
169 case IEEE80211_BAND_2GHZ
: {
171 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
172 flag
= IEEE80211_RATE_MANDATORY_G
;
174 flag
= IEEE80211_RATE_MANDATORY_B
;
179 case IEEE80211_BAND_5GHZ
:
180 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
183 case IEEE80211_NUM_BANDS
:
189 /* No matching basic rate found; use highest suitable mandatory
194 /* Time needed to transmit ACK
195 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
196 * to closest integer */
198 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
199 tx
->sdata
->bss_conf
.use_short_preamble
);
202 /* Frame is fragmented: duration increases with time needed to
203 * transmit next fragment plus ACK and 2 x SIFS. */
204 dur
*= 2; /* ACK + SIFS */
206 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
207 txrate
->bitrate
, erp
,
208 tx
->sdata
->bss_conf
.use_short_preamble
);
214 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
217 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
220 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
223 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
226 static int inline is_ieee80211_device(struct net_device
*dev
,
227 struct net_device
*master
)
229 return (wdev_priv(dev
->ieee80211_ptr
) ==
230 wdev_priv(master
->ieee80211_ptr
));
235 static ieee80211_txrx_result
236 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
238 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
239 struct sk_buff
*skb
= tx
->skb
;
240 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
241 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
244 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TX_INJECTED
))
245 return TXRX_CONTINUE
;
247 if (unlikely(tx
->local
->sta_sw_scanning
) &&
248 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
249 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
252 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
253 return TXRX_CONTINUE
;
255 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
257 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
258 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
259 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
&&
260 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
261 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
262 DECLARE_MAC_BUF(mac
);
263 printk(KERN_DEBUG
"%s: dropped data frame to not "
264 "associated station %s\n",
265 tx
->dev
->name
, print_mac(mac
, hdr
->addr1
));
266 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
267 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
271 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
272 tx
->local
->num_sta
== 0 &&
273 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
)) {
275 * No associated STAs - no need to send multicast
280 return TXRX_CONTINUE
;
283 return TXRX_CONTINUE
;
286 static ieee80211_txrx_result
287 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
289 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
291 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
292 ieee80211_include_sequence(tx
->sdata
, hdr
);
294 return TXRX_CONTINUE
;
297 /* This function is called whenever the AP is about to exceed the maximum limit
298 * of buffered frames for power saving STAs. This situation should not really
299 * happen often during normal operation, so dropping the oldest buffered packet
300 * from each queue should be OK to make some room for new frames. */
301 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
303 int total
= 0, purged
= 0;
305 struct ieee80211_sub_if_data
*sdata
;
306 struct sta_info
*sta
;
309 * virtual interfaces are protected by RCU
313 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
314 struct ieee80211_if_ap
*ap
;
315 if (sdata
->dev
== local
->mdev
||
316 sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
)
319 skb
= skb_dequeue(&ap
->ps_bc_buf
);
324 total
+= skb_queue_len(&ap
->ps_bc_buf
);
328 read_lock_bh(&local
->sta_lock
);
329 list_for_each_entry(sta
, &local
->sta_list
, list
) {
330 skb
= skb_dequeue(&sta
->ps_tx_buf
);
335 total
+= skb_queue_len(&sta
->ps_tx_buf
);
337 read_unlock_bh(&local
->sta_lock
);
339 local
->total_ps_buffered
= total
;
340 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
341 wiphy_name(local
->hw
.wiphy
), purged
);
344 static ieee80211_txrx_result
345 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
348 * broadcast/multicast frame
350 * If any of the associated stations is in power save mode,
351 * the frame is buffered to be sent after DTIM beacon frame.
352 * This is done either by the hardware or us.
355 /* not AP/IBSS or ordered frame */
356 if (!tx
->sdata
->bss
|| (tx
->fc
& IEEE80211_FCTL_ORDER
))
357 return TXRX_CONTINUE
;
359 /* no stations in PS mode */
360 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
361 return TXRX_CONTINUE
;
363 /* buffered in mac80211 */
364 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
365 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
366 purge_old_ps_buffers(tx
->local
);
367 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
369 if (net_ratelimit()) {
370 printk(KERN_DEBUG
"%s: BC TX buffer full - "
371 "dropping the oldest frame\n",
374 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
376 tx
->local
->total_ps_buffered
++;
377 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
381 /* buffered in hardware */
382 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_SEND_AFTER_DTIM
;
384 return TXRX_CONTINUE
;
387 static ieee80211_txrx_result
388 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
390 struct sta_info
*sta
= tx
->sta
;
391 DECLARE_MAC_BUF(mac
);
394 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
395 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
396 return TXRX_CONTINUE
;
398 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
399 struct ieee80211_tx_packet_data
*pkt_data
;
400 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 printk(KERN_DEBUG
"STA %s aid %d: PS buffer (entries "
403 print_mac(mac
, sta
->addr
), sta
->aid
,
404 skb_queue_len(&sta
->ps_tx_buf
));
405 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
406 sta
->flags
|= WLAN_STA_TIM
;
407 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
408 purge_old_ps_buffers(tx
->local
);
409 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
410 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
411 if (net_ratelimit()) {
412 printk(KERN_DEBUG
"%s: STA %s TX "
413 "buffer full - dropping oldest frame\n",
414 tx
->dev
->name
, print_mac(mac
, sta
->addr
));
418 tx
->local
->total_ps_buffered
++;
419 /* Queue frame to be sent after STA sends an PS Poll frame */
420 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
421 if (tx
->local
->ops
->set_tim
)
422 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
425 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
427 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
428 pkt_data
->jiffies
= jiffies
;
429 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
432 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
433 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
434 printk(KERN_DEBUG
"%s: STA %s in PS mode, but pspoll "
435 "set -> send frame\n", tx
->dev
->name
,
436 print_mac(mac
, sta
->addr
));
438 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
441 return TXRX_CONTINUE
;
444 static ieee80211_txrx_result
445 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
447 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
448 return TXRX_CONTINUE
;
450 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
451 return ieee80211_tx_h_unicast_ps_buf(tx
);
453 return ieee80211_tx_h_multicast_ps_buf(tx
);
456 static ieee80211_txrx_result
457 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
459 struct ieee80211_key
*key
;
462 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
464 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
466 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
468 else if (tx
->sdata
->drop_unencrypted
&&
469 !(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_EAPOL_FRAME
) &&
470 !(tx
->flags
& IEEE80211_TXRXD_TX_INJECTED
)) {
471 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
479 tx
->key
->tx_rx_count
++;
480 /* TODO: add threshold stuff again */
482 switch (tx
->key
->conf
.alg
) {
484 ftype
= fc
& IEEE80211_FCTL_FTYPE
;
485 stype
= fc
& IEEE80211_FCTL_STYPE
;
487 if (ftype
== IEEE80211_FTYPE_MGMT
&&
488 stype
== IEEE80211_STYPE_AUTH
)
492 if (!WLAN_FC_DATA_PRESENT(fc
))
498 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
499 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
501 return TXRX_CONTINUE
;
504 static ieee80211_txrx_result
505 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
507 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
508 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
509 struct sk_buff
**frags
, *first
, *frag
;
513 int frag_threshold
= tx
->local
->fragmentation_threshold
;
515 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
516 return TXRX_CONTINUE
;
520 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
521 payload_len
= first
->len
- hdrlen
;
522 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
523 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
525 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
529 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
530 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
531 pos
= first
->data
+ hdrlen
+ per_fragm
;
532 left
= payload_len
- per_fragm
;
533 for (i
= 0; i
< num_fragm
- 1; i
++) {
534 struct ieee80211_hdr
*fhdr
;
540 /* reserve enough extra head and tail room for possible
543 dev_alloc_skb(tx
->local
->tx_headroom
+
545 IEEE80211_ENCRYPT_HEADROOM
+
546 IEEE80211_ENCRYPT_TAILROOM
);
549 /* Make sure that all fragments use the same priority so
550 * that they end up using the same TX queue */
551 frag
->priority
= first
->priority
;
552 skb_reserve(frag
, tx
->local
->tx_headroom
+
553 IEEE80211_ENCRYPT_HEADROOM
);
554 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
555 memcpy(fhdr
, first
->data
, hdrlen
);
556 if (i
== num_fragm
- 2)
557 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
558 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
559 copylen
= left
> per_fragm
? per_fragm
: left
;
560 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
565 skb_trim(first
, hdrlen
+ per_fragm
);
567 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
568 tx
->u
.tx
.extra_frag
= frags
;
570 return TXRX_CONTINUE
;
573 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
575 for (i
= 0; i
< num_fragm
- 1; i
++)
577 dev_kfree_skb(frags
[i
]);
580 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
584 static ieee80211_txrx_result
585 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data
*tx
)
588 return TXRX_CONTINUE
;
590 switch (tx
->key
->conf
.alg
) {
592 return ieee80211_crypto_wep_encrypt(tx
);
594 return ieee80211_crypto_tkip_encrypt(tx
);
596 return ieee80211_crypto_ccmp_encrypt(tx
);
604 static ieee80211_txrx_result
605 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
607 struct rate_selection rsel
;
608 struct ieee80211_supported_band
*sband
;
610 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->local
->hw
.conf
.channel
->band
];
612 if (likely(!tx
->u
.tx
.rate
)) {
613 rate_control_get_rate(tx
->dev
, sband
, tx
->skb
, &rsel
);
614 tx
->u
.tx
.rate
= rsel
.rate
;
615 if (unlikely(rsel
.probe
)) {
616 tx
->u
.tx
.control
->flags
|=
617 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
618 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
619 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
;
620 tx
->u
.tx
.rate
= rsel
.probe
;
622 tx
->u
.tx
.control
->alt_retry_rate
= NULL
;
627 tx
->u
.tx
.control
->alt_retry_rate
= NULL
;
629 if (tx
->sdata
->bss_conf
.use_cts_prot
&&
630 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && rsel
.nonerp
) {
631 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
633 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
635 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
636 tx
->u
.tx
.rate
= rsel
.nonerp
;
637 tx
->u
.tx
.control
->tx_rate
= rsel
.nonerp
;
638 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
640 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
641 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
;
643 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
;
645 return TXRX_CONTINUE
;
648 static ieee80211_txrx_result
649 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
651 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
652 u16 fc
= le16_to_cpu(hdr
->frame_control
);
654 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
656 if (!control
->retry_limit
) {
657 if (!is_multicast_ether_addr(hdr
->addr1
)) {
658 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
659 && tx
->local
->rts_threshold
<
660 IEEE80211_MAX_RTS_THRESHOLD
) {
662 IEEE80211_TXCTL_USE_RTS_CTS
;
664 IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
665 control
->retry_limit
=
666 tx
->local
->long_retry_limit
;
668 control
->retry_limit
=
669 tx
->local
->short_retry_limit
;
672 control
->retry_limit
= 1;
676 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
677 /* Do not use multiple retry rates when sending fragmented
679 * TODO: The last fragment could still use multiple retry
681 control
->alt_retry_rate
= NULL
;
684 /* Use CTS protection for unicast frames sent using extended rates if
685 * there are associated non-ERP stations and RTS/CTS is not configured
687 if ((tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
) &&
688 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP_G
) &&
689 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
690 tx
->sdata
->bss_conf
.use_cts_prot
&&
691 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
692 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
694 /* Transmit data frames using short preambles if the driver supports
695 * short preambles at the selected rate and short preambles are
696 * available on the network at the current point in time. */
697 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
698 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
) &&
699 tx
->sdata
->bss_conf
.use_short_preamble
&&
700 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
701 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_SHORT_PREAMBLE
;
704 /* Setup duration field for the first fragment of the frame. Duration
705 * for remaining fragments will be updated when they are being sent
706 * to low-level driver in ieee80211_tx(). */
707 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
708 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
709 tx
->u
.tx
.extra_frag
[0]->len
: 0);
710 hdr
->duration_id
= cpu_to_le16(dur
);
712 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
713 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
714 struct ieee80211_supported_band
*sband
;
715 struct ieee80211_rate
*rate
, *baserate
;
718 sband
= tx
->local
->hw
.wiphy
->bands
[
719 tx
->local
->hw
.conf
.channel
->band
];
721 /* Do not use multiple retry rates when using RTS/CTS */
722 control
->alt_retry_rate
= NULL
;
724 /* Use min(data rate, max base rate) as CTS/RTS rate */
725 rate
= tx
->u
.tx
.rate
;
728 for (idx
= 0; idx
< sband
->n_bitrates
; idx
++) {
729 if (sband
->bitrates
[idx
].bitrate
> rate
->bitrate
)
731 if (tx
->sdata
->basic_rates
& BIT(idx
) &&
733 (baserate
->bitrate
< sband
->bitrates
[idx
].bitrate
)))
734 baserate
= &sband
->bitrates
[idx
];
738 control
->rts_cts_rate
= baserate
;
740 control
->rts_cts_rate
= &sband
->bitrates
[0];
744 tx
->sta
->tx_packets
++;
745 tx
->sta
->tx_fragments
++;
746 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
747 if (tx
->u
.tx
.extra_frag
) {
749 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
750 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
752 tx
->u
.tx
.extra_frag
[i
]->len
;
757 return TXRX_CONTINUE
;
760 static ieee80211_txrx_result
761 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
763 struct ieee80211_local
*local
= tx
->local
;
764 struct sk_buff
*skb
= tx
->skb
;
765 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
766 u32 load
= 0, hdrtime
;
767 struct ieee80211_rate
*rate
= tx
->u
.tx
.rate
;
769 /* TODO: this could be part of tx_status handling, so that the number
770 * of retries would be known; TX rate should in that case be stored
771 * somewhere with the packet */
773 /* Estimate total channel use caused by this frame */
775 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
776 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
778 if (tx
->u
.tx
.channel
->band
== IEEE80211_BAND_5GHZ
||
779 (tx
->u
.tx
.channel
->band
== IEEE80211_BAND_2GHZ
&&
780 rate
->flags
& IEEE80211_RATE_ERP_G
))
781 hdrtime
= CHAN_UTIL_HDR_SHORT
;
783 hdrtime
= CHAN_UTIL_HDR_LONG
;
786 if (!is_multicast_ether_addr(hdr
->addr1
))
789 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
791 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
794 /* TODO: optimise again */
795 load
+= skb
->len
* CHAN_UTIL_RATE_LCM
/ rate
->bitrate
;
797 if (tx
->u
.tx
.extra_frag
) {
799 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
801 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
802 tx
->u
.tx
.rate
->bitrate
;
806 /* Divide channel_use by 8 to avoid wrapping around the counter */
807 load
>>= CHAN_UTIL_SHIFT
;
808 local
->channel_use_raw
+= load
;
810 tx
->sta
->channel_use_raw
+= load
;
811 tx
->sdata
->channel_use_raw
+= load
;
813 return TXRX_CONTINUE
;
816 /* TODO: implement register/unregister functions for adding TX/RX handlers
817 * into ordered list */
819 ieee80211_tx_handler ieee80211_tx_handlers
[] =
821 ieee80211_tx_h_check_assoc
,
822 ieee80211_tx_h_sequence
,
823 ieee80211_tx_h_ps_buf
,
824 ieee80211_tx_h_select_key
,
825 ieee80211_tx_h_michael_mic_add
,
826 ieee80211_tx_h_fragment
,
827 ieee80211_tx_h_encrypt
,
828 ieee80211_tx_h_rate_ctrl
,
830 ieee80211_tx_h_load_stats
,
834 /* actual transmit path */
837 * deal with packet injection down monitor interface
838 * with Radiotap Header -- only called for monitor mode interface
840 static ieee80211_txrx_result
841 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data
*tx
,
845 * this is the moment to interpret and discard the radiotap header that
846 * must be at the start of the packet injected in Monitor mode
848 * Need to take some care with endian-ness since radiotap
849 * args are little-endian
852 struct ieee80211_radiotap_iterator iterator
;
853 struct ieee80211_radiotap_header
*rthdr
=
854 (struct ieee80211_radiotap_header
*) skb
->data
;
855 struct ieee80211_supported_band
*sband
;
856 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
857 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
859 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->local
->hw
.conf
.channel
->band
];
861 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
862 tx
->flags
|= IEEE80211_TXRXD_TX_INJECTED
;
863 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
866 * for every radiotap entry that is present
867 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
868 * entries present, or -EINVAL on error)
874 ret
= ieee80211_radiotap_iterator_next(&iterator
);
879 /* see if this argument is something we can use */
880 switch (iterator
.this_arg_index
) {
882 * You must take care when dereferencing iterator.this_arg
883 * for multibyte types... the pointer is not aligned. Use
884 * get_unaligned((type *)iterator.this_arg) to dereference
885 * iterator.this_arg for type "type" safely on all arches.
887 case IEEE80211_RADIOTAP_RATE
:
889 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
890 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
892 target_rate
= (*iterator
.this_arg
) * 5;
893 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
894 struct ieee80211_rate
*r
;
896 r
= &sband
->bitrates
[i
];
898 if (r
->bitrate
== target_rate
) {
905 case IEEE80211_RADIOTAP_ANTENNA
:
907 * radiotap uses 0 for 1st ant, mac80211 is 1 for
910 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
914 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
915 control
->power_level
= *iterator
.this_arg
;
919 case IEEE80211_RADIOTAP_FLAGS
:
920 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
922 * this indicates that the skb we have been
923 * handed has the 32-bit FCS CRC at the end...
924 * we should react to that by snipping it off
925 * because it will be recomputed and added
928 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
931 skb_trim(skb
, skb
->len
- FCS_LEN
);
933 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
935 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
936 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
937 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
941 * Please update the file
942 * Documentation/networking/mac80211-injection.txt
943 * when parsing new fields here.
951 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
955 * remove the radiotap header
956 * iterator->max_length was sanity-checked against
957 * skb->len by iterator init
959 skb_pull(skb
, iterator
.max_length
);
961 return TXRX_CONTINUE
;
967 static ieee80211_txrx_result
968 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
970 struct net_device
*dev
,
971 struct ieee80211_tx_control
*control
)
973 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
974 struct ieee80211_hdr
*hdr
;
975 struct ieee80211_sub_if_data
*sdata
;
979 memset(tx
, 0, sizeof(*tx
));
981 tx
->dev
= dev
; /* use original interface */
983 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
984 tx
->u
.tx
.control
= control
;
986 * Set this flag (used below to indicate "automatic fragmentation"),
987 * it will be cleared/left by radiotap as desired.
989 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
991 /* process and remove the injection radiotap header */
992 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
993 if (unlikely(sdata
->vif
.type
== IEEE80211_IF_TYPE_MNTR
)) {
994 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TXRX_DROP
)
998 * __ieee80211_parse_tx_radiotap has now removed
999 * the radiotap header that was present and pre-filled
1000 * 'tx' with tx control information.
1004 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1006 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1007 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
1009 if (is_multicast_ether_addr(hdr
->addr1
)) {
1010 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
1011 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1013 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
1014 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
1017 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
1018 if ((tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
1019 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1020 !local
->ops
->set_frag_threshold
)
1021 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
1023 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
1027 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1028 else if (tx
->sta
->clear_dst_mask
) {
1029 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1030 tx
->sta
->clear_dst_mask
= 0;
1033 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
1034 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1035 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1036 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1038 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
1040 return TXRX_CONTINUE
;
1044 * NB: @tx is uninitialised when passed in here
1046 static int ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1047 struct sk_buff
*skb
,
1048 struct net_device
*mdev
,
1049 struct ieee80211_tx_control
*control
)
1051 struct ieee80211_tx_packet_data
*pkt_data
;
1052 struct net_device
*dev
;
1054 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1055 dev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1056 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1062 /* initialises tx with control */
1063 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1068 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1069 struct ieee80211_txrx_data
*tx
)
1071 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1074 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1075 __ieee80211_queue_stopped(local
, 0)) {
1076 netif_stop_queue(local
->mdev
);
1077 return IEEE80211_TX_AGAIN
;
1080 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1081 "TX to low-level driver", skb
);
1082 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1084 return IEEE80211_TX_AGAIN
;
1085 local
->mdev
->trans_start
= jiffies
;
1086 ieee80211_led_tx(local
, 1);
1088 if (tx
->u
.tx
.extra_frag
) {
1089 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1090 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1091 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1092 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1093 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1094 if (!tx
->u
.tx
.extra_frag
[i
])
1096 if (__ieee80211_queue_stopped(local
, control
->queue
))
1097 return IEEE80211_TX_FRAG_AGAIN
;
1098 if (i
== tx
->u
.tx
.num_extra_frag
) {
1099 control
->tx_rate
= tx
->u
.tx
.last_frag_rate
;
1101 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1103 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1106 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1109 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1110 "TX to low-level driver",
1111 tx
->u
.tx
.extra_frag
[i
]);
1112 ret
= local
->ops
->tx(local_to_hw(local
),
1113 tx
->u
.tx
.extra_frag
[i
],
1116 return IEEE80211_TX_FRAG_AGAIN
;
1117 local
->mdev
->trans_start
= jiffies
;
1118 ieee80211_led_tx(local
, 1);
1119 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1121 kfree(tx
->u
.tx
.extra_frag
);
1122 tx
->u
.tx
.extra_frag
= NULL
;
1124 return IEEE80211_TX_OK
;
1127 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1128 struct ieee80211_tx_control
*control
)
1130 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1131 struct sta_info
*sta
;
1132 ieee80211_tx_handler
*handler
;
1133 struct ieee80211_txrx_data tx
;
1134 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1137 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1139 if (unlikely(skb
->len
< 10)) {
1144 /* initialises tx */
1145 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1147 if (res_prepare
== TXRX_DROP
) {
1153 * key references are protected using RCU and this requires that
1154 * we are in a read-site RCU section during receive processing
1159 tx
.u
.tx
.channel
= local
->hw
.conf
.channel
;
1161 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1163 res
= (*handler
)(&tx
);
1164 if (res
!= TXRX_CONTINUE
)
1168 skb
= tx
.skb
; /* handlers are allowed to change skb */
1173 if (unlikely(res
== TXRX_DROP
)) {
1174 I802_DEBUG_INC(local
->tx_handlers_drop
);
1178 if (unlikely(res
== TXRX_QUEUED
)) {
1179 I802_DEBUG_INC(local
->tx_handlers_queued
);
1184 if (tx
.u
.tx
.extra_frag
) {
1185 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1187 struct ieee80211_hdr
*hdr
=
1188 (struct ieee80211_hdr
*)
1189 tx
.u
.tx
.extra_frag
[i
]->data
;
1191 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1192 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1195 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1197 dur
= ieee80211_duration(&tx
, 0, next_len
);
1198 hdr
->duration_id
= cpu_to_le16(dur
);
1203 ret
= __ieee80211_tx(local
, skb
, &tx
);
1205 struct ieee80211_tx_stored_packet
*store
=
1206 &local
->pending_packet
[control
->queue
];
1208 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1210 set_bit(IEEE80211_LINK_STATE_PENDING
,
1211 &local
->state
[control
->queue
]);
1213 /* When the driver gets out of buffers during sending of
1214 * fragments and calls ieee80211_stop_queue, there is
1215 * a small window between IEEE80211_LINK_STATE_XOFF and
1216 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1217 * gets available in that window (i.e. driver calls
1218 * ieee80211_wake_queue), we would end up with ieee80211_tx
1219 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1220 * continuing transmitting here when that situation is
1221 * possible to have happened. */
1222 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1223 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1224 &local
->state
[control
->queue
]);
1227 memcpy(&store
->control
, control
,
1228 sizeof(struct ieee80211_tx_control
));
1230 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1231 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1232 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1233 store
->last_frag_rate_ctrl_probe
=
1234 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1242 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1243 if (tx
.u
.tx
.extra_frag
[i
])
1244 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1245 kfree(tx
.u
.tx
.extra_frag
);
1250 /* device xmit handlers */
1252 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1253 struct net_device
*dev
)
1255 struct ieee80211_tx_control control
;
1256 struct ieee80211_tx_packet_data
*pkt_data
;
1257 struct net_device
*odev
= NULL
;
1258 struct ieee80211_sub_if_data
*osdata
;
1263 * copy control out of the skb so other people can use skb->cb
1265 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1266 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1268 if (pkt_data
->ifindex
)
1269 odev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1270 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1274 if (unlikely(!odev
)) {
1275 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1276 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1277 "originating device\n", dev
->name
);
1282 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1284 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1285 if (skb_headroom(skb
) < headroom
) {
1286 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1293 control
.vif
= &osdata
->vif
;
1294 control
.type
= osdata
->vif
.type
;
1295 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1296 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1297 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1298 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1299 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1300 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1301 if (pkt_data
->flags
& IEEE80211_TXPD_EAPOL_FRAME
)
1302 control
.flags
|= IEEE80211_TXCTL_EAPOL_FRAME
;
1303 if (pkt_data
->flags
& IEEE80211_TXPD_AMPDU
)
1304 control
.flags
|= IEEE80211_TXCTL_AMPDU
;
1305 control
.queue
= pkt_data
->queue
;
1307 ret
= ieee80211_tx(odev
, skb
, &control
);
1313 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1314 struct net_device
*dev
)
1316 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1317 struct ieee80211_tx_packet_data
*pkt_data
;
1318 struct ieee80211_radiotap_header
*prthdr
=
1319 (struct ieee80211_radiotap_header
*)skb
->data
;
1322 /* check for not even having the fixed radiotap header part */
1323 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1324 goto fail
; /* too short to be possibly valid */
1326 /* is it a header version we can trust to find length from? */
1327 if (unlikely(prthdr
->it_version
))
1328 goto fail
; /* only version 0 is supported */
1330 /* then there must be a radiotap header with a length we can use */
1331 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1333 /* does the skb contain enough to deliver on the alleged length? */
1334 if (unlikely(skb
->len
< len_rthdr
))
1335 goto fail
; /* skb too short for claimed rt header extent */
1337 skb
->dev
= local
->mdev
;
1339 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1340 memset(pkt_data
, 0, sizeof(*pkt_data
));
1341 /* needed because we set skb device to master */
1342 pkt_data
->ifindex
= dev
->ifindex
;
1344 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1347 * fix up the pointers accounting for the radiotap
1348 * header still being in there. We are being given
1349 * a precooked IEEE80211 header so no need for
1352 skb_set_mac_header(skb
, len_rthdr
);
1354 * these are just fixed to the end of the rt area since we
1355 * don't have any better information and at this point, nobody cares
1357 skb_set_network_header(skb
, len_rthdr
);
1358 skb_set_transport_header(skb
, len_rthdr
);
1360 /* pass the radiotap header up to the next stage intact */
1361 dev_queue_xmit(skb
);
1362 return NETDEV_TX_OK
;
1366 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1370 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1371 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1372 * @skb: packet to be sent
1373 * @dev: incoming interface
1375 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1376 * not be freed, and caller is responsible for either retrying later or freeing
1379 * This function takes in an Ethernet header and encapsulates it with suitable
1380 * IEEE 802.11 header based on which interface the packet is coming in. The
1381 * encapsulated packet will then be passed to master interface, wlan#.11, for
1382 * transmission (through low-level driver).
1384 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1385 struct net_device
*dev
)
1387 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1388 struct ieee80211_tx_packet_data
*pkt_data
;
1389 struct ieee80211_sub_if_data
*sdata
;
1390 int ret
= 1, head_need
;
1391 u16 ethertype
, hdrlen
, fc
;
1392 struct ieee80211_hdr hdr
;
1393 const u8
*encaps_data
;
1394 int encaps_len
, skip_header_bytes
;
1396 struct sta_info
*sta
;
1399 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1400 if (unlikely(skb
->len
< ETH_HLEN
)) {
1401 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1402 dev
->name
, skb
->len
);
1407 nh_pos
= skb_network_header(skb
) - skb
->data
;
1408 h_pos
= skb_transport_header(skb
) - skb
->data
;
1410 /* convert Ethernet header to proper 802.11 header (based on
1411 * operation mode) */
1412 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1413 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1415 switch (sdata
->vif
.type
) {
1416 case IEEE80211_IF_TYPE_AP
:
1417 case IEEE80211_IF_TYPE_VLAN
:
1418 fc
|= IEEE80211_FCTL_FROMDS
;
1420 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1421 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1422 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1425 case IEEE80211_IF_TYPE_WDS
:
1426 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1428 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1429 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1430 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1431 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1434 case IEEE80211_IF_TYPE_STA
:
1435 fc
|= IEEE80211_FCTL_TODS
;
1437 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1438 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1439 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1442 case IEEE80211_IF_TYPE_IBSS
:
1444 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1445 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1446 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1455 * There's no need to try to look up the destination
1456 * if it is a multicast address (which can only happen
1459 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1460 sta
= sta_info_get(local
, hdr
.addr1
);
1462 sta_flags
= sta
->flags
;
1467 /* receiver is QoS enabled, use a QoS type frame */
1468 if (sta_flags
& WLAN_STA_WME
) {
1469 fc
|= IEEE80211_STYPE_QOS_DATA
;
1474 * Drop unicast frames to unauthorised stations unless they are
1475 * EAPOL frames from the local station.
1477 if (unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1478 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1479 !(ethertype
== ETH_P_PAE
&&
1480 compare_ether_addr(dev
->dev_addr
,
1481 skb
->data
+ ETH_ALEN
) == 0))) {
1482 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1483 DECLARE_MAC_BUF(mac
);
1485 if (net_ratelimit())
1486 printk(KERN_DEBUG
"%s: dropped frame to %s"
1487 " (unauthorized port)\n", dev
->name
,
1488 print_mac(mac
, hdr
.addr1
));
1491 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1497 hdr
.frame_control
= cpu_to_le16(fc
);
1498 hdr
.duration_id
= 0;
1501 skip_header_bytes
= ETH_HLEN
;
1502 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1503 encaps_data
= bridge_tunnel_header
;
1504 encaps_len
= sizeof(bridge_tunnel_header
);
1505 skip_header_bytes
-= 2;
1506 } else if (ethertype
>= 0x600) {
1507 encaps_data
= rfc1042_header
;
1508 encaps_len
= sizeof(rfc1042_header
);
1509 skip_header_bytes
-= 2;
1515 skb_pull(skb
, skip_header_bytes
);
1516 nh_pos
-= skip_header_bytes
;
1517 h_pos
-= skip_header_bytes
;
1519 /* TODO: implement support for fragments so that there is no need to
1520 * reallocate and copy payload; it might be enough to support one
1521 * extra fragment that would be copied in the beginning of the frame
1522 * data.. anyway, it would be nice to include this into skb structure
1525 * There are few options for this:
1526 * use skb->cb as an extra space for 802.11 header
1527 * allocate new buffer if not enough headroom
1528 * make sure that there is enough headroom in every skb by increasing
1529 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1530 * alloc_skb() (net/core/skbuff.c)
1532 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1533 head_need
-= skb_headroom(skb
);
1535 /* We are going to modify skb data, so make a copy of it if happens to
1536 * be cloned. This could happen, e.g., with Linux bridge code passing
1537 * us broadcast frames. */
1539 if (head_need
> 0 || skb_cloned(skb
)) {
1541 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1542 "of headroom\n", dev
->name
, head_need
);
1545 if (skb_cloned(skb
))
1546 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1548 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1549 /* Since we have to reallocate the buffer, make sure that there
1550 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1551 * before payload and 12 after). */
1552 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1554 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1561 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1562 nh_pos
+= encaps_len
;
1563 h_pos
+= encaps_len
;
1566 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1567 __le16
*qos_control
;
1569 qos_control
= (__le16
*) skb_push(skb
, 2);
1570 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1572 * Maybe we could actually set some fields here, for now just
1573 * initialise to zero to indicate no special operation.
1577 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1582 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1583 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1584 pkt_data
->ifindex
= dev
->ifindex
;
1585 if (ethertype
== ETH_P_PAE
)
1586 pkt_data
->flags
|= IEEE80211_TXPD_EAPOL_FRAME
;
1588 skb
->dev
= local
->mdev
;
1589 dev
->stats
.tx_packets
++;
1590 dev
->stats
.tx_bytes
+= skb
->len
;
1592 /* Update skb pointers to various headers since this modified frame
1593 * is going to go through Linux networking code that may potentially
1594 * need things like pointer to IP header. */
1595 skb_set_mac_header(skb
, 0);
1596 skb_set_network_header(skb
, nh_pos
);
1597 skb_set_transport_header(skb
, h_pos
);
1599 dev
->trans_start
= jiffies
;
1600 dev_queue_xmit(skb
);
1611 /* helper functions for pending packets for when queues are stopped */
1613 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1616 struct ieee80211_tx_stored_packet
*store
;
1618 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1619 if (!__ieee80211_queue_pending(local
, i
))
1621 store
= &local
->pending_packet
[i
];
1622 kfree_skb(store
->skb
);
1623 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1624 kfree_skb(store
->extra_frag
[j
]);
1625 kfree(store
->extra_frag
);
1626 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1630 void ieee80211_tx_pending(unsigned long data
)
1632 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1633 struct net_device
*dev
= local
->mdev
;
1634 struct ieee80211_tx_stored_packet
*store
;
1635 struct ieee80211_txrx_data tx
;
1636 int i
, ret
, reschedule
= 0;
1638 netif_tx_lock_bh(dev
);
1639 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1640 if (__ieee80211_queue_stopped(local
, i
))
1642 if (!__ieee80211_queue_pending(local
, i
)) {
1646 store
= &local
->pending_packet
[i
];
1647 tx
.u
.tx
.control
= &store
->control
;
1648 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1649 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1650 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1652 if (store
->last_frag_rate_ctrl_probe
)
1653 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1654 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1656 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1659 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1664 netif_tx_unlock_bh(dev
);
1666 if (!ieee80211_qdisc_installed(dev
)) {
1667 if (!__ieee80211_queue_stopped(local
, 0))
1668 netif_wake_queue(dev
);
1670 netif_schedule(dev
);
1674 /* functions for drivers to get certain frames */
1676 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1677 struct ieee80211_if_ap
*bss
,
1678 struct sk_buff
*skb
,
1679 struct beacon_data
*beacon
)
1683 int i
, have_bits
= 0, n1
, n2
;
1685 /* Generate bitmap for TIM only if there are any STAs in power save
1687 read_lock_bh(&local
->sta_lock
);
1688 if (atomic_read(&bss
->num_sta_ps
) > 0)
1689 /* in the hope that this is faster than
1690 * checking byte-for-byte */
1691 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1692 IEEE80211_MAX_AID
+1);
1694 if (bss
->dtim_count
== 0)
1695 bss
->dtim_count
= beacon
->dtim_period
- 1;
1699 tim
= pos
= (u8
*) skb_put(skb
, 6);
1700 *pos
++ = WLAN_EID_TIM
;
1702 *pos
++ = bss
->dtim_count
;
1703 *pos
++ = beacon
->dtim_period
;
1705 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1709 /* Find largest even number N1 so that bits numbered 1 through
1710 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1711 * (N2 + 1) x 8 through 2007 are 0. */
1713 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1720 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1727 /* Bitmap control */
1729 /* Part Virt Bitmap */
1730 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1732 tim
[1] = n2
- n1
+ 4;
1733 skb_put(skb
, n2
- n1
);
1735 *pos
++ = aid0
; /* Bitmap control */
1736 *pos
++ = 0; /* Part Virt Bitmap */
1738 read_unlock_bh(&local
->sta_lock
);
1741 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1742 struct ieee80211_vif
*vif
,
1743 struct ieee80211_tx_control
*control
)
1745 struct ieee80211_local
*local
= hw_to_local(hw
);
1746 struct sk_buff
*skb
;
1747 struct net_device
*bdev
;
1748 struct ieee80211_sub_if_data
*sdata
= NULL
;
1749 struct ieee80211_if_ap
*ap
= NULL
;
1750 struct rate_selection rsel
;
1751 struct beacon_data
*beacon
;
1752 struct ieee80211_supported_band
*sband
;
1754 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
1758 sdata
= vif_to_sdata(vif
);
1762 beacon
= rcu_dereference(ap
->beacon
);
1764 if (!ap
|| sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
|| !beacon
) {
1765 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1766 if (net_ratelimit())
1767 printk(KERN_DEBUG
"no beacon data avail for %s\n",
1769 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1774 /* headroom, head length, tail length and maximum TIM length */
1775 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
1776 beacon
->tail_len
+ 256);
1780 skb_reserve(skb
, local
->tx_headroom
);
1781 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1784 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1786 ieee80211_beacon_add_tim(local
, ap
, skb
, beacon
);
1789 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
1793 rate_control_get_rate(local
->mdev
, sband
, skb
, &rsel
);
1795 if (net_ratelimit()) {
1796 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: "
1798 wiphy_name(local
->hw
.wiphy
));
1806 control
->tx_rate
= rsel
.rate
;
1807 if (sdata
->bss_conf
.use_short_preamble
&&
1808 rsel
.rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
1809 control
->flags
|= IEEE80211_TXCTL_SHORT_PREAMBLE
;
1810 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1811 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1812 control
->retry_limit
= 1;
1813 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1822 EXPORT_SYMBOL(ieee80211_beacon_get
);
1824 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1825 const void *frame
, size_t frame_len
,
1826 const struct ieee80211_tx_control
*frame_txctl
,
1827 struct ieee80211_rts
*rts
)
1829 const struct ieee80211_hdr
*hdr
= frame
;
1832 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1833 rts
->frame_control
= cpu_to_le16(fctl
);
1834 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
1836 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1837 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1839 EXPORT_SYMBOL(ieee80211_rts_get
);
1841 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1842 const void *frame
, size_t frame_len
,
1843 const struct ieee80211_tx_control
*frame_txctl
,
1844 struct ieee80211_cts
*cts
)
1846 const struct ieee80211_hdr
*hdr
= frame
;
1849 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1850 cts
->frame_control
= cpu_to_le16(fctl
);
1851 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
1852 frame_len
, frame_txctl
);
1853 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1855 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1858 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
1859 struct ieee80211_vif
*vif
,
1860 struct ieee80211_tx_control
*control
)
1862 struct ieee80211_local
*local
= hw_to_local(hw
);
1863 struct sk_buff
*skb
;
1864 struct sta_info
*sta
;
1865 ieee80211_tx_handler
*handler
;
1866 struct ieee80211_txrx_data tx
;
1867 ieee80211_txrx_result res
= TXRX_DROP
;
1868 struct net_device
*bdev
;
1869 struct ieee80211_sub_if_data
*sdata
;
1870 struct ieee80211_if_ap
*bss
= NULL
;
1871 struct beacon_data
*beacon
;
1873 sdata
= vif_to_sdata(vif
);
1881 beacon
= rcu_dereference(bss
->beacon
);
1883 if (sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
|| !beacon
||
1890 if (bss
->dtim_count
!= 0)
1891 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1892 memset(control
, 0, sizeof(*control
));
1894 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1897 local
->total_ps_buffered
--;
1899 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1900 struct ieee80211_hdr
*hdr
=
1901 (struct ieee80211_hdr
*) skb
->data
;
1902 /* more buffered multicast/broadcast frames ==> set
1903 * MoreData flag in IEEE 802.11 header to inform PS
1905 hdr
->frame_control
|=
1906 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1909 if (!ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
))
1911 dev_kfree_skb_any(skb
);
1914 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1915 tx
.u
.tx
.channel
= local
->hw
.conf
.channel
;
1917 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1918 res
= (*handler
)(&tx
);
1919 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1922 skb
= tx
.skb
; /* handlers are allowed to change skb */
1924 if (res
== TXRX_DROP
) {
1925 I802_DEBUG_INC(local
->tx_handlers_drop
);
1928 } else if (res
== TXRX_QUEUED
) {
1929 I802_DEBUG_INC(local
->tx_handlers_queued
);
1938 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);